Pythonic way to determine whether not null list entries are 'continuous'

Question

I\'m looking for a way to easily determine if all not None items in a list occur in a single continuous slice. I\'ll use integers as examples of not None items

Answer 1

One liner:

contiguous = lambda l: ' ' not in ''.join('x '[x is None] for x in l).strip()

The real work is done by the strip function. If there are spaces in a stripped string, then they're not leading/trailing. The rest of the function converts the list to a string, which has a space for each None.